Answer:
The song/poem is about a guy who is in love but don't have any money or possesions. The only thing he has in life to give to a lady is LOVE.
Step-by-step explanation:
If you read carefully the lyrics of the poem/song "Fine Knacks for Ladies" You can find is about a guy in the street singing probably to a woman.
In the part: "Good pennyworths but money cannot move,
I keep a fair but for the fair to view, A beggar may be liberal of love". Can assume the guy is having not money at all and all he can give is love.
The rest of the song is about all the things people can find in a market and with that give them to the love ones.
and in the final part of the song that says: "But in my heart, where duty serves and loves, Turtles and twins, Court’s brood, a heav’nly pair. Happy the man that thinks of no removes."
Can assume that love is the more important thing this guy has in life.